(Faux) M16A2 (Bulgarian AR)

The "M16A2" rifles used in the film appear to be Arsenal AR's housed in an M16-type shell. These mockups are fitted with various M16A2 parts including the carrying handle, buttstock, front sight, and A2 handguards, but the AR charging handle is still visible. This movie was filmed in Bulgaria, hence the same armorers used the mockups that were also featured in the Jean-Claude Van Damme films Universal Soldier: Regeneration and The Shepherd: Border Patrol.

Arsenal AR - 7.62x39mm

Troops engage the spiders. The "M16A2" seen here appears to be a mocked up Arsenal AR seen frequently in movies filmed in Bulgaria.

M134 Minigun

A humvee is seen with what supposed to be an M134 Minigun mounted on the roof.